Weighted Stability Ball Crunch (Full range)
- Zielmuskel
- Rectus Abdominis
- Synergistenmuskeln
- Obliques
- Equipment
- Weighted
- Körperregion
- Waist
- Typ
- Strength
The weighted stability ball crunch (full range) is an abdominal strength exercise that targets the rectus abdominis through a greater arc of motion than a floor crunch, with the obliques working as synergists to stabilize the trunk. Holding a weight plate or dumbbell against your chest while lying over a stability ball increases resistance and extends the stretch at the bottom. It is well-suited for building core strength and adding size to the abdominal wall.
Weighted Stability Ball Crunch (Full range): So führst du sie aus
- 1Select a weight plate or dumbbell you can control through the full range of motion and hold it against your chest with both hands.
- 2Sit on a stability ball and walk your feet forward until the ball is positioned in the curve of your lower back, with your knees bent at roughly 90° and feet flat on the floor, hip-width apart.
- 3Lean back until your torso is slightly below parallel to the floor, allowing your lower back to drape over the ball — this is your starting position and the stretched bottom of the range.
- 4Brace your core lightly, then curl your upper body upward by contracting your rectus abdominis, lifting your shoulder blades and upper back off the ball.
- 5Continue curling until your torso reaches approximately 30–45° above horizontal — do not sit all the way up, as that shifts work to the hip flexors.
- 6Pause briefly at the top with your abs fully contracted.
- 7Slowly lower your torso back down, allowing your spine to extend over the ball and your abs to stretch at the bottom, under control.
- 8Complete all reps, then set the weight down before stepping off the ball.
Technik-Tipps
- Keep the movement in your spine, not your hips — your hips and legs should remain still throughout each rep.
- Match the speed of the lowering phase to the lifting phase; a slow, controlled descent maximizes time under tension in the rectus abdominis.
- Position the ball under your lumbar spine so the arch of the ball provides a genuine stretch at the bottom — too high or too low and you lose the range-of-motion advantage.
- Press your feet firmly into the floor and keep your knees tracking over your toes to maintain stability on the ball.
- Start with a lighter weight than you think you need; balance demands on a stability ball reduce the load you can safely control compared to a flat surface.
Häufige Fehler
- Pulling on the weight with your arms or jerking the torso up, which uses momentum instead of abdominal force and reduces muscle tension.
- Sitting all the way up to vertical, which transfers the load from the rectus abdominis to the hip flexors and shortens the working range of the abs.
- Allowing the hips to drop or the ball to roll during the rep, which destabilizes the position and reduces core engagement.
- Skipping the stretch at the bottom by reversing the rep too early, eliminating the key benefit this exercise has over floor crunches.
- Choosing too heavy a weight before mastering balance on the ball, increasing the risk of falling and reducing control over the movement.
Häufig gestellte Fragen
What muscles does the weighted stability ball crunch work?
The primary muscle worked is the rectus abdominis — the vertical muscle that runs down the front of the abdomen. The obliques act as synergists, helping to stabilize the trunk throughout the movement.
Why do a crunch on a stability ball instead of on the floor?
The curve of the stability ball allows your spine to extend below horizontal at the bottom of the rep, giving the rectus abdominis a longer stretch and a greater range of motion than a flat surface allows. Adding weight increases the resistance through that full range.
What weight should I start with?
Begin with a 5–10 lb plate and focus on controlling the full range of motion before adding load. Balance on the ball is an additional challenge, so your effective working weight will be lower than on a stable surface.
How many sets and reps are recommended?
Three to four sets of 10–15 controlled reps works well for most goals. Prioritize range of motion and a deliberate tempo over high rep counts with sloppy form.
Is this exercise safe for people with lower back issues?
The extended stretch over the ball can place significant load on the lumbar spine, so individuals with existing lower back problems should consult a healthcare professional before attempting this exercise. Those without back issues should still build up load gradually and avoid hyperextending aggressively at the bottom.
